Oscillations Damping in multi-machine System by the using of Unified Power Flow Controller-UPFC

Electrical Engineering

Unified Power Flow Controller (UPFC) is most important device which used to help in damping out the oscillations which present in the system. UPFC device is the most flexible FACTS equipments. UPFC execute the combined functions of the controlled reactor (TCR), static synchronous compensator (STATCOM), thyristor controlled reactor (TCR), thyristor switched capacitor (TSC). By using this device the phase angle regulator offers the flexibility for the dynamic and static operation of the power network. In the transmission line all the electrical variable can be controlled by the FACTS device. By the use of FACTS we can control various applications concerned of the power system, like power flow scheduling; power oscillations damping and enhancing the transient stability. We are present here the studies & result on FACTS devic & their impact of oscillations on power system. In the FACTS device one important tool UPFC device which have capability to control independent true power & active power . By use of this device reliability & quality of supply of system can be improvised. Various types of oscillations as consequence & interaction of its component in power system. Worldwide the most common oscillations that is observed is electromechanically oscillations in power system. Oscillations may occurs because of many reason such as change of load, disturbances in network , fault in the system etc. Here we studied about smooth power flow control, transient stability and how to enhancement it, stability of small disturbance for small time & improvement and oscillation damping in the system. In the family of FACTS device UPFC have flexible characteristics.

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